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\bibitem{Chen_etal2019} {\textquotedblleft}\textit{Inner and outer ring states of MoS2 quantum rings : energy spectrum, charge and spin currents}{\textquotedblright}. Chen Q, Li LL, Peeters FM, Journal of applied physics \textbf{125}, 244303 (2019).   http://doi.org/10.1063/1.5094200

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